Stropping-machine.



o. E. DUNN. STROPPING MACHINE. APPLIUATION` FILED SEPT. 11, 1907.

Patented Dec.17,1912.

@7% .4" @5mn/'id @Normand lyn, countyof Kings, and

'srnoiaPINe-MACHINE.

l Specification of vLetters Batent. Patented Dec. 17, 1912.

Application fgled'September 11, 1907. Serial No. 392,258.

To all rwhom 'it may concern:

a. citizen of the United States, residing in the city of New York, borouh of Brooktate of New York, have invented certain `new and useful Imrovements' in Stropping-Machmes,

I' 'of whic the following is a full, clear, and

exact specification.

My invention relates .to razor stropping machines, and articularly tomachines for I stropping doub e-edge blades, and it is well adapted tohold and strop such blades when they are formed of thin and flexibleplates having a thickness of about seven one-thousandths of an inch,although it is likewise adapted to blades of greater thickness.

My invention has for its object to provlde means for holding such bladesin a stropping frame and for causing the edges of the blades to besuccessively brought into contact with an abrading surface, whereby theyare all sharpened, and to this end my invention consists in thecombination of devices and mechanical elements hereinafter described andclaimed, and one embodiment of which is illustrated in the accompanyingdrawings, wherein- Figure 1 is a side elevation of my device with arazor blade therein partly in section. Fig. 2 is a cross-section lookingto the right von the line 2 2 of Fig. Il, a strop belng added. Fig. 3 isa similar view illustrating different positions of the blade. Fig. 4 isan end view. Fig. 5 is an enlarged top view ofthe blade-holder, and Fig. 6 is a cross-sectional detail. view of the slipping connection inthe blade support, taken on the line 67-6 of Fig. 5.

Like reference numerals indicate corresponding parts in the differentfigures of the drawing. y p

My stropping machine has inner and outer end frames or plates 1, 2,connected by rods 3, 4, which are suitably secured, as by being rivetedto said plates, and which carry loose strop-guiding sleeves or rollers,A- handle 7 is suitably attached to a convenient point, as plate 1. Ashaft 8 is mounted in suitable bearings in plates 1 and 2 and has fastupon it a strop-guiding,

frictionA roller 9. The shaft and friction roller are rotated or rockedby the passage of the strop I0 over the friction roller.

This strop passes under the outside rollers' Be it known that I,CLIFFORD E. DUNN,

5, 6, and is thereby, when held taut, caused to have a` tenacious gripupon friction roller 9.

A. pair of rocking arms 11, 12, are fixed upon shaft 8 and carry attheir outer ends the blade support. The blade-support in Ithe presentillustration comprises a shaft 13 mounted in bearings in said arms andhaving fixed to it, intermedia. the blade-carrying plate 14, havingretaining lugs 15, which are adapted toenter perforations in the .blade16. Hinged to said shaft at 17 is a retaining plate 18, perforated topermit thev lugs 15 to pass through, and held in closed position by anarm 19 hinged to the shaft. Shaft 13 has a squared end 2O (seen insection in Fig. 6), and is retained in position' by four spring fingers21, which are pinned to the gear 22, and the free ends of which hug saidsquared end 20 and provide a slipping engagement which is used inreversing the position of the blade.

The means for turning the blade so as to bring its edges to stroppingposit-ion comprise a. semicircular'rack 23, fixed to frameplate 1underneath and in position to mesh with a pinion 24, which is fixed uponone end of a-short axlev 25, mounted to turn in rock arm 12, and havingfixedy to it at its outer end a pinion 26. Pinion 26 meshes with gearwheel 22, which is fixed upon axle 27, and this axle is carried in-abearing in arm 12, in which it is free to turn.

The means for reversing the blade-holder comprise a socket 28, fixed onshaft 13, and carrying reversing pins `29, 30. These pins revolve uponthe rotation of shaft 13. The motion of the pins is arrested by detent31, which lies in their path of revolution. The detent 31 is showncarried by a spring arm 32, secured to the outer side of the frameplate2 by riveting. The said detent passes through a perforation in the frameplate 2 to permit it to lie within vthe path of the pins.

The operation of my device is as follows: A blade having been insertedbetween plates 14, 18, and being hold therein, we will assume that themachine is moved to the left (Fig. 2). This will cause a clockwiserotation of roller 9 and will move rocking arms 11, 12 to the right insaid figure. Pinion 24 willv thereupon be rotated clockwise saidbearings,

causing a` corresponding rotation of pinion 26 and a counter revolutionof pinion 22. This Will cause the blade-holder and blade to be rockedtoward the strop and to be turned as it is rocked. For convenience Iwill designate the opposite sides of the two edges of the blade, asillustrated in Fig. 2, by the letters A, B, C, D. lVhen the parts are inposition illustrated iii Fig'. 2, and the pins 29, 30 canted asillustrated in Fig. 4, the turning motion of the blade-holder into thedotted line position of Fig. 4 will be such that the lower edge A, I),of the blade will swing to the right and appioacli the strop, bringingedge A to strtipping position.

The blade is then in the position illustrated in full lines in Fig. 3,with the pin 29 under the detent and the side A of the blade beingstropped. Upon a reversal ot' the relative movement ot' the blade andstrop, the arms will rock away from the strop and the tendency oi pin2t) will be to turn upward. 'lhis will be resisted by the detent, whichwill cause the blade support to slip in the connection 2t?, 21, therebytrailing the pin 2S) over the outer face of the detent as the arms arerocked and reversing tlre position oit' the blade, and causing the bladeto again assume the position of Fig. 2, with the edges A, l), uppermostand edges C, B, lowermost. A continuation of this reversed movement willcause a reverse of the previously described operation; z. e., the stropthen moving to the let't (as in Fig. 4) will cause friction roller H torotate counter clockwise, thereby swinging` arms 11, 12 in the samedirection and causing a correspondii'ig rotation of gears 2i. 2G throughcontact of the former with rack 2B. This will cause a clockwise movementot gear 22, bringing the lower edge l5 to stropping position. Upon areversal-mt the relative movement: ot' strop and stropping device, theparts will then be returned as they Caine to starting position. with theedges l), A, uppermostl and (l, l, lowermost. and

the parts will tlien again be in the originali position, with thi`ilitl'erenee that the edge which originally was underneath 'is now ontop. A repetition ot the original operation will now take plaee, whereinedge (l. which now occupies the position originally occupied by edge A,will be prought to stropping position, and upon the return the bladewill again be reversed by the detent leaving the parts aty theconclusion oi' the third movement, with the edges again -in the originalposition. with lr. (l, uppermost and A, D, below, and the. fourth'movement will cause the edge 'li to be st'ropped. as it caused edgeli-to be Istropped when in that position. The parts will then bereturnedto starting position with lli-e edges in the origi-nal loi-ations. andthe operations may be repeated indefinitely. 'lty will therefore beperceived that four movements are provided,

yield and permit the blade to be reversed when the pins engage thedetent.

It is obvious that many modifications and changes may be made in myinvention Without departing from the spirit thereof, and I do notI meanto limit myself" to the precise construction shown and deseribed,lbnt

What I claim anddesire to secure by Letters Patent is:

1. "A machine for sharpening double-edge razor blades, comprisinga'blade-holdel' having blade-positioning members located in position forcausing both 4'edges of the blade held thereby to be exposed,`andmechanism for actuating the holder to'presentl both sides of both edgesof such blade in position to be engaged by the same'abrading surface. 2.A machine for sharpeningr double-edged razor blades, including ablade-holder `adapted to receive and hold a double-edged blade with bothedges exposed to a common abrading surface, and suitable automaticmeelninism for actuating the holder so as to present the sides of bothexposed edges siiceessively to the act-ion of said common abradingsurface.

3. .X machine for sharpening double-edge razor blades comprising arocking support for the blade adapted to expose both its edges, meansfor rocking said support relative to an abrading surface, and means forautomatically reversing the' position of 'said blade.

At. In ay machine for stropping double edged razor blades, thecombination of a blade holder constructed and adapted for exposing bothedges of a double edged blade held thereby, and mechanism operative uponsufh holder for automatically reversing the relai ire sides of theholder for reversing the relative position of the edges bf 'the bladewith respect to an abrading surface,

5. In a machine for sharpening doubleedge razor blades, a rocking bladeSupport and means for rocking samea.daptedslic cessively to canseopposite sides of an edge to engage unabradnd surface, and means -l'orautoniaticallylreversing the position of the blade whereby the-oppositesides-of the other edge.' will be similarly treated.

ln a machine for sharpening doubleedge razor blades,'a rocking bladesupport and means for rocking saine aetuatedby a relative movementbetween the sti-op and the lio machine, means for turning said bladeinto stropping position as it rocks, and means for automaticallyreversing the relative p0- sition or" the edges of the blade.

7. In a machine for stropping doubleedge razor blades, a frame, afriction roller, rocking arms actuated thereby, a blade support carriedby said arms, means on the frame for turning said support as it rocks,and means for automatically reversing the position of said bladesupport. e

8. In a machine for stropping doubleedge razor blades, a frame, afriction roller, rocking arms actuated thereby, a blade support carriedby said arms, a rack A0n said. frame, ya pinion on the blade supportturned from said rack, a slipping connection between said pinion andsaid blade support, and means on. the frame for reversing the positionof the blade support.

S). In a 4machine for stropping doubleedge razor blades, a frame, afriction roller, rocking arms actuated thereby, a blade supportcarriedby said arms, means onthe frame for turning said support as it rocks, aslipping connection between said blade support and said turning means, aprojection on. said blade support and adetent on the frame adapted toreverse the position of said blade support.

10. In a machine for stropping doubleedge razor blades, a frame,strop-guiding rods therein, a friction roller, rocking arms actuatedthereby, a blade support carried by said. roclnng arms, a semi-circularrack 1n the frame, a pinion engaging the periphery thereof, a secondpinion on the blade vsupport actuated thereby, a slipping connectionbetween said pinion and blade support, a strop on the frame, and aprojection on the blade support engaging the same and adapted to reversethe position of the blade.

1l. A. machine for stropping double-edge razor blades having a bladeho-lder adapted to expose both edges of the blade, means for causing arocking movement of the blade holder toward the strop, and means forreversing the position of the blade every other movement.

.from said rack, a slipping connectiony between said pinion and saidblade support, means for holding the blade in correct position, andmeans on the .frame for reversing the position of the blade support.

13. In amachine for stropping double- 1.ledge razor blades, a frame, afriction roller,

rocking arms actuated thereby, a blade support carried by said arms,means on the frame for turning said support as it rocks,

va slipping connection between said blade support and said turningmeans, a projection on said blade support, and a spring detent on theframe adapted to permit the said projection to pass over it in onedirection and to reverse the position of said blade support.

14. In a machine for stropping doubleedged razor blades, the combinationof a blade-holder constructed and adapted to eX- pose both edges of adouble-edged blade held thereby, and mechanism operative upon saidholder for automatically reversing the relative sides of the holder andblade with respect to an abrading surface.

15. In a machinefor stropping doubleedged razor blades, the combinationot' a frame, a stropping element, a Maule-holder mounted in said frameconstructed and adapted for exposing both edges of a double-edged bladeheld thereby to the action of the stropping element, a pair of rotarymembers mounted in the frame, and means t'or automatically reversing thebladeholder upon the movement of said. rotary members.

In testimony whereof, Ihave hereunto set witnesses.

CLIFFORD E. DUNN.

Witnesses Anomu F. l)1Nsn, CLAUDE C. NEVILLE,

